F.474 Low

Viessmann F.474 Fault Code

Also written as F474 — same fault.

The Viessmann F.474 fault code means: your boiler's computer system has detected a temporary glitch in its internal clock or scheduling software, causing it to stop following your programmed heating and hot water times.. It appears on 4 Viessmann models in our database.

Monitor it

This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.

Technical description: Error in scheduled program run monitoring
Typical repair cost £100-250 (including labour)

DIY fix possible

Switch off the boiler at the fused spur or mains power supply.Wait for at least 60 seconds to allow the internal processor to fully reset.Switch the power back on and check if the boiler resumes normal operation.

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Viessmann models that show the F.474 fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Viessmann F.474 fault code information on this page is sourced and cross-checked against the official Viessmann service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026